Measured values for Bulwer's Petrel eggs and eggshells from
Laysan Island, Northwestern Hawaiian Islands, were within 10% of predicted
values available in the literature. In the absence of published predictive equations
for egg volume, fresh-egg contents, and total functional pore area of the
shell, in Procellariiformes, new logarithmic relationships were developed for
tropical Procellariiformes. Data are now needed for species breeding at higher
latitudes to determine if these relationships are representative of all Procellariiformes.